chore: rename ClusterContext to NodeContext

src/ClusterManager.cpp

@@ -1,6 +1,6 @@
 #include "ClusterManager.h"
 
-ClusterManager::ClusterManager(ClusterContext& ctx) : ctx(ctx) {
+ClusterManager::ClusterManager(NodeContext& ctx) : ctx(ctx) {
     // Register callback for node_discovered event
     ctx.registerEvent("node_discovered", [this](void* data) {
         NodeInfo* node = static_cast<NodeInfo*>(data);